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Evidence for exclusive γγ → W+ W− production and constraints on anomalous quartic gauge couplings in pp collisions at √s = 7 and 8 TeV

CMS Collaboration; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Knünz, V.; ... mehr

Abstract (englisch): A search for exclusive or quasi-exclusive γγ → W + W − production, via pp → p (*) W + W − p (*) → p (*) μ ± e ∓ p (*) at s = 8 s√=8 TeV, is reported using data corresponding to an integrated luminosity of 19.7 fb −1 . Events are selected by requiring the presence of an electron-muon pair with large transverse momentum p T ( μ ± e ∓ ) > 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 fb −1 of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 ± 0.6 (0.84 ± 0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4σ over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive γγ → W + W − production. Upper limits on the anomalous quartic gauge coupling operators a 0, C W (dimension-6) and f M 0,1,2,3 (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum.

Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1007/JHEP08(2016)119
ISSN: 1126-6708
URN: urn:nbn:de:swb:90-595962
KITopen ID: 1000059596
Erschienen in Journal of high energy physics
Band 2016
Heft 8
Seiten 119
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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